Relay.



PATENTED FEB. 27, 1906.

H. JOHANSSON.

RELAY.

APPLICATION FILED JULY 21. 1904.

Q Vvtmoo co UNITED STATES PATENT oF IoE.

HEMMING JOHANSSON, OF STOQKHOLM, SWEDEN, ASSIGNOR TO AKTIE- BOLAGET .L. M. ERICSSON & (10., OF STOCKHOLM, SWEDEN, A CORPO- RATION.

RELAY.

Specification of Letters Patent.

Patented Feb. 27, 1906.

To all whom it may concern:

'Be it known that I, HEMMING J OHANSSON,

'a subject of the King of Sweden and Norway,

and a resident of Stockholm, Sweden, have invented'certain new and useful Improvements in Relays, of which the following is a specification.

- parts hereinafter fully described, and particularly pointed out in the claims.

One of the objects of my invention is to construct a relay the armature of which will respond to direct and pulsating currents of electricity, but which remains unresponsive to'alternatin currents.

Another 0 jct of the invention is to so construct and mount the armature that by attaining a large leverage the exertion of a minimum amount of power will cause the application of a maximum amount of force atthe contact-points;

A further object is to combine the several elements in such a manner that when the armature has been attracted to one of the polepieces of the electromagnet it will remam so without vibration, causing the contact to be stead and secure, the armature being unaffecte by the action of an alternating current and only receding from the pole-piece upon sto pa e of the pulsating current.

11 t e accompanying drawings, wherein like reference characters refer to like parts throughout, Figure .1 is a front elevational view of the relay. Fig. 2 is a side elevational view of the relay. Fig. 3 is a top plan View of the same, and Fig. 4 is a perspective view of the armature.

Referring to the drawings, 1 designates a bridge upon which are mounted the electromagnetic coils 2 and 3. Passing through the coils are the pole-pieces 4 and 5, upon the top of which the plate 6 is secured. Resting upon the plate 6 and properly fastened thereto is an insulating-block 7, carrying contacts 8 and 9, held by screws 10 passing through plates 9 which form part of the contacts 8 and 9 and overlap the upper edges of the block 7. A permanent magnet 11 is secured to the bridge 1 and extends therefrom to the plate 6. The pole-pieces 4 and 5 are surrounded by copper sockets 12 and 13, respectively, to a height flush with the top. of the spoo s 1 1 and 15 of the coils of the magnet.

The armature 16 is mounted on a rod or pin. 17, extending upwardly from the bridge 1. At its lower end the pin 17 has a pivot 18, which finds a bearing in the bridge 1. As shown clearly in Fig. 4, the armature 16 has two hook or claw shaped parts 19, the inner or scooped-out portions 20 bein ada ted to rest against the pole-pieces 4 an 5. he armature may be compared to a double-armed lever fulcrumed at its center 17. For the purpose of preventing the armature from ad-' hering to the pole-pieces when the flow of the current has ceased screws 21, havin stopnuts 22, are threaded through the hooked portions of each end of the armature. Projecting upwardly from the armature 16 is a pin 23, having an insulated cover 24 for the purpose of pressing the contacts 8 and 9 together when the armature is attracted to the pole-piece 5.

Mounted upon the plate 6 is a standard 25, having a threaded bore through which a slotted screw 26 passes horizontally. A screw 27 extends downwardly into the standard 25 and reaches into the slot 28 of the screw 26. A thumbnut 29 is threaded on the slotted screw 26 for regulating the tension at which the armature is held, as hereinafter explained. The screw 26 is provided at one end with an eye 30, retaining one end of a spiral spring 31, the other end of the spring encircling the pin 32, mounted upon the armature 16.

The operation of the relay is as follows: When a pulsating current flows through the electromagnet, the armature will be attracted, the end resting against pole at being repulsed and the opposite end drawn against the tension of spring 31 toward and against pole 5 and retained there steadily throughout the flow of the current. This action of the armature will cause the pin 23 to press against spring 9 and force it into contact with spring 8. Owing to the proximity of the pin 23 to the rod 17, (the fulcrum of the lever.) the pin 23 will exert considerable force against spring 9 without the need of a large expenditure of power at the end of the armature. When the current has ceased to flow through the coils, the spring 31 will draw the armature back to its normal position-viz., with one end thereof contacting with the pole 4. The tension of ,the armature may be regulated by more or less extending the spring 31. When the spring 31 is properly ad usted, the screw 27 is screwed home into the slot 28 of the screw 26 and so held tightly. Should an alternating current pass through the electromagnet, it would not have the effect of break ing contact between the pole 5 and the corresponding end of the armature. This is due partly to the inertia of the armature itself and in art to the copper sockets surrounding the po es, which tend to offset the energizing of the pole-pieces.

Having now described my invention, what I claim as new, and desire to secure byLetters Patent, is

1. In a relay, the combination of electromagnetic coils, an insulating-block associated therewith, a contact secured at each end of said block, and an armature adapted to alternately engage the poles of the electromagnetic coils and to press the contacts together, substantially as described.

2. In a relay, the combination of electro,

magnetic coils, a pivoted armature, a set of contacts, and means near the center of the armature for pressing the contacts together when the armature is attracted, substantially as described.

3. In a relay, the combination of electromagnetic coils, an insulating-block arranged over the coils, a spring-contact secured to ,each end of said block, the free ends of said contacts overla ping, and an oscillating ar-' mature adapte to press said contacts together, substantially as described 4. In a relay the combination of electromagnetic coils a pivoted armature having a hook-shaped part at each end thereof and a set of contacts arranged to be pressed to ether when the armature is attracted, said rookshaped parts being adapted to alternately engage the pole-pieces of the coils. substantially as described.

5. In a relay, the combination of electromagnetic coils, a double-armed armature pivoted at its center, a set of contacts, and means near the center of the armature for pressing the contacts together, substantially as described.

6. In a relay, the combination of electromagnetic coils, an armature with hook-shap ed ends adapted to alternately partiall encircle the pole-pieces of said coils, a set 0 contacts associated with the armature, means for returning the armature to its normal position and means for preventing the armature from adhering to said poleieces u on cessation of the flow of current, su stantia ly as described.

7. In a relay, the combination of electromagnetic coils, an armature pivoted intermediately of the coils, a set of contacts adapted to be pressed together by the armature when the latter is attracted, and means for regulating the tension of the armature, said means comprising a slotted screw mounted in a standard, and a spring extending from said screw to a post on the armature substantially as described. I 8. In a relay, the combination of electromagnetic coils, pole-pieces passing therethrough, said pole pieces being surrounded by copper sockets, a plate mounted on said polepieces carrying an insulating-block, contacts on said block, an armature pivoted near its center having an insulated pin for ressing together said contacts, an adjustab e screw mounted on said plate, a second plate, a second pin on the armature and a spring extending from said screw to said second in for returning the armature to its norma position, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HEMMING JOHANSSON.

Witnesses:

KLAS WEMAN, PAUL NEUHUT. 

